Spoilage of feed and mould growth are also contributory factors to feed waste and loss. These problems are most prevalent in feeds that are not appropriately processed. They are also prevalent in tropical regions where the hot, humid climate favours growth of mould on feed.
A compound called sodium calcium alumino-silicate is effective in controlling spoilage and mould damage of feed, and could safely be used at 0.5% without any detrimental effects on poultry. Also, the use of feed silos may help alleviate the spoilage problem, and also protect feeds against invasion by rodents or wild birds. From an economic standpoint, the cost of a 20-tonne silo (about US$ 6,000) could be recovered in just two years, as it could save up to 2,000-3,000, being the value of feed that could be lost each year through other feed storage systems. Additional saving could be achieved with regular cleaning and proper maintenance of the silos, and also with the use of antioxidants and other preservatives throughout the production cycle.